<template>
    <div class="row">
        <div v-for="column in columnList" :key="column._id" class="col-4 mb-4">
            <div class="card h-100 shadow-sm">
               <div class="card-body text-center">
                    <img :src="column.avatar && column.avatar.url" :alt="column.title" class="rounded-circle border border-light my-3">
                    <h5 class="card-title">{{column.title}}</h5>
                    <p class="card-text text-left">{{column.description}}</p>
                    <router-link :to="`/column/${column._id}`" class="btn btn-outline-primary">进入专栏</router-link>
               </div>
            </div>
        </div>
    </div>
</template>

<script lang="ts">
import { addColumnAvatar } from '@/helper'
import {computed, defineComponent,PropType} from 'vue'
import {ColumnProps} from '../store'

export default defineComponent({
    name:'ColumnList',
    props:{
        list:{
            type:Array as PropType<ColumnProps[]>,
            required:true
        }
    },
    setup(props){
        const columnList = computed(()=>{
            //map() 方法返回一个新数组，数组中的元素为原始数组元素调用函数处理后的值。
            return props.list.map(column =>{
                addColumnAvatar(column, 50, 50)
                return column
            })
        })
        return {
            columnList
        }
    }
})
</script>
<style scoped>
.card-body img{
    width:50px;
    height:50px;
}
</style>